If you pinpoint something or its position, you discover or show exactly where it is. I could pinpoint his precise location on a map Computers pinpointed where the shells were coming from
the sharp point of a pin a very brief moment; "they were strangers sharing a pinpoint of time together"
If you pinpoint the cause of something, you discover or explain the cause exactly. It was almost impossible to pinpoint the cause of death. if you can pinpoint exactly what the anger is about The commission pinpoints inadequate housing as a basic problem threatening village life. = identify
If something is placed with pinpoint accuracy, it is placed in exactly the right place or position. the pinpoint accuracy of the bombing campaigns
locate exactly; "can you pinpoint the position of the enemy?"; "The chemists could not nail the identity of the chromosome"